package cn.yangliu.comm.tools;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import java.util.Objects;

/**
 * spring工具
 * Created by zhouyou on 2017/5/18.
 */
@Component
@Slf4j
public class SpringContextUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if (Objects.isNull(SpringContextUtils.applicationContext)) {
            SpringContextUtils.applicationContext = applicationContext;
        }
        //在普通类可以通过调用SpringUtils.getAppContext()获取applicationContext对象,
        log.info("========ApplicationContext配置成功,applicationContext=" + SpringContextUtils.applicationContext + "========");
    }

    /**
     * 获取applicationContext
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 通过name获取 Bean.
     */
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }

    /**
     * 通过class获取Bean.
     */
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }

    /**
     * 通过name,以及Clazz返回指定的Bean
     */
    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }

}
